Both awards will be presented in December at the 2013 AGU Fall Meeting in San Francisco.

"We are deeply grateful that NCAR's groundbreaking work is receiving such a high level of international recognition," Thomas Bogdan, president of the University Corporation for Atmospheric Research -- which manages NCAR on behalf of the National Science Foundation -- said in a news release. "Basic research into the atmosphere, as well as the communication of scientific results, provide critical benefits for society."

The Bowie Medal was established in 1939 in honor of AGU's founding president. It is awarded for outstanding contributions to fundamental geophysics and unselfish cooperation in research.

Roble is recognized as a leader in the development of computer models simulating the interrelationships among the outer atmospheric regions known as the thermosphere, ionosphere and mesosphere. These have been used to analyze data gathered from many NSF observing programs and NASA satellites, and have been adapted to study the upper atmospheres of other planets, including Venus, Mars and Jupiter.

Trenberth is the third recipient of the AGU Climate Communication Prize, which was established in 2011.

The prize recognizes Trenberth's longstanding work in explaining climate to the media and public, and his dedication to education and outreach. Trenberth, a senior scientist in NCAR's Earth System Laboratory since 1986 and an internationally recognized climate expert, has given numerous talks for public audiences about climate change and its potential consequences.

The American Geophysical Union, with 62,000 members from 144 countries, is one of the world's leading scientific organizations.

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